select list with "add new option" - Joomla! Forum - community, help and support

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hi,
i want create custom form field select list, can add new options via chosen search option.
just "position selection list" in modules can add own option.

regards.

update: more details:

when editing module in joomla, there "position" field in right side bar.
in field can select position module published.
in addition "selecting" position, can "add" new position typing name in search position of "chosen select".

that "position" field created in:
administrator/components/com_modules/views/module/tmpl/edit_positions.php

i tried create custom form field based on file, when change "select.groupedlist" "select.genericlist", "add new option feature" no longer available.

can please explain in detail





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